CN104525135A - Dual-gel adsorbent and production method thereof - Google Patents
Dual-gel adsorbent and production method thereof Download PDFInfo
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- CN104525135A CN104525135A CN201510027074.9A CN201510027074A CN104525135A CN 104525135 A CN104525135 A CN 104525135A CN 201510027074 A CN201510027074 A CN 201510027074A CN 104525135 A CN104525135 A CN 104525135A
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- gelatin
- oxidized starch
- hydroxyapatite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28078—Pore diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
Abstract
The invention discloses a dual-gel adsorbent and a production method thereof. The used materials are as follows: gelatin (AR), hydrogen peroxide (AR), hydrochloric acid (AR), sodium hydroxide (AR), calcium hydroxide (AR), phosphoric acid (AR) and corn starch (AR). The required instruments are as follows: a 98HW-1 type thermostatic agitator, a JSM26460 scanning electron microscopy, a JM-1200GX type transmission electron microscope, an X/max2000PC type X-ray diffractometer, and an ASAP2020 series automatic quick specific surface area and mesopore/micropores analysis instrument. The production method comprises the following steps: (1) preparing oxidized starch; (2) preparing oxidized starch/gelatin; (3) preparing hydroxyapatite/oxidized starch/gelatin; and (4) analyzing a hydroxyapatite/oxidized starch/gelatin structure. The hydroxyapatite/oxidized starch/gelatin hybrid xerogel beam provided by the invention has a uniform amorphous structure, is loose and porous, has certain specific surface area and pore size, can be used for adsorbing metal ions and reactive dyes in waste water, and thus is a multifunctional hybrid adsorbing material.
Description
Technical field
The present invention relates to formula of a kind of adsorbent and preparation method thereof, be specifically related to a kind of two gel adsorber and preparation method thereof.
Technical background
The protein that gelatin is collagen partial hydrolysis and obtains, easy gelation, has good biocompatibility and biodegradability, due to wide material sources, with low cost, has a wide range of applications in food, medicine and other fields.Gelatin is a kind of typical thermal reversion hydrogel-dissolve in 65 DEG C of-70 DEG C of hot water, and when solution temperature solidifies plastic lower than when 35 DEG C, its sol gel process is reversible.Containing a large amount of hydroxyl, carboxyl and amino in gelatin molecule structure, therefore both there is acidic-group, again there is basic group.Hydrogel prepared by gelatin-based can adsorb metal ion in waste water and reactive dye, but gelatin has extremely strong hydrophily, water-soluble fast, the hydrogel of formation is too soft, for cannot external forces be born during wastewater treatment, be that it applies limited main cause.For improving the performance of gelatin substrate further, the crosslinking agent such as formaldehyde, glutaraldehyde and gelatin can be utilized to carry out, and crosslinked to strengthen its hardness blended with hydroxyapatite again, and by controlling the swellbility of gelatin hydrogel to the control of the degree of cross linking.And the bio-toxicity of formaldehyde, glutaraldehyde limits its application as crosslinking agent.Crosslinking agent is turned to natural organic crosslinking agent-cornstarch by researchers, but cornstarch is because the carbonyl content contained is limited, and the cross-linked structure formed with gelatin is unstable.Corn shallow lake is modified as the dual oxide starch simultaneously containing carboxyl and aldehyde radical by seminar, the aldehyde radical contained can react with the amino of gelatin and form stable schiff bases (Schiffs base), form constitutionally stable biological hydridization xerogel bundle with the hydroxyapatite self assembly with loose structure simultaneously, can adsorbing metal ions, simultaneously can absorbing dye ion.Experimental design gelatin and oxidized starch form stable cross-linked structure, inorganic hydroxyapatite material embeds cross-linked structure in self assembly mode, form the biological hybridized hydrogel of Stability Analysis of Structures good adsorption performance, micro-wave vacuum method builds hydroxyapatite/oxidized starch/gelatin biological hydridization xerogel bundle, utilize X-ray diffractometer, SEM, full-automatic specific area and mesopore/micropore analyzer fast, transmission electron microscope, Fourier infrared spectrographs etc. are to hydroxyapatite/oxidized starch/gelatin xerogel Shu Jinhang structural characterization and analysis, judge the characterization of adsorption of this hydridization xerogel bundle thus.
Summary of the invention
Goal of the invention:
In order to solve the problems of the technologies described above, propose a kind of two gel adsorber and preparation method thereof.
Technical scheme:
A kind of two gel adsorber and preparation method thereof, the material required for it has: gelatin (analyzing pure), hydrogen peroxide (analyzing pure), hydrochloric acid (analyzing pure), NaOH (analyzing pure), calcium hydroxide (analyzing pure), phosphoric acid (analyzing pure), cornstarch (analyzing pure); Instrument required for it has: 98HW-1 type thermostatic mixer, JSM26460 SEM, JM-1200GX type transmission electron microscope, X/max2000PC type X-ray diffractometer, ASAP2020 series full-automatic specific area and mesopore/micropore analyzer fast; Its making step: (1) prepares oxidized starch, (2) prepare oxidized starch/gelatin, (3) prepare hydroxyapatite/oxidized starch/gelatin, (4) analyze hydroxyapatite/oxidized starch/gelatin structure.
Further, it is prepared oxidized starch method and is: in three-necked bottle, add the corn starch milk that mass fraction is 30%, with 1% NaOH and hydrochloric acid, its pH value is adjusted to 4.0; Then warming while stirring is incubated 1h to 80 DEG C, and the temperature of reactant liquor remains on 50 DEG C and continues to stir the hydrogen peroxide slowly dripping cornstarch mass fractions 30%, dropwises rear reaction 6h, by mixed liquor high speed centrifugation separation immediately; The oxidised maize starch obtained is at vacuum drying chamber, and drying box temperature is 45 DEG C, dry 24h; Survey final oxidized starch containing carboxyl amount by conductometry, hydroxylamine hydrochloride potentiometric titration records aldehyde radical amount.
Further, it is prepared oxidized starch/gelatin method and is: at 50 DEG C, compound concentration is the gelatin solution of 3%, adds appropriate oxidised maize starch, and gelatin and oxidised maize starch mass ratio are 6: 4, regulates pH to be 5.5; Reactant liquor is warming up to 80 DEG C, front 30min rotating speed is 100rpm, and rear 30min rotating speed is 500rpm, obtained oxidized starch/gelatin solution.
Further, it is prepared hydroxyapatite/oxidized starch/gelatin method and is: adopt sol-gel process to prepare containing Na
2+ion hydroxyapatite is configured to solution, joins in the solution of oxidized starch/gelatine system, is incubated 60 DEG C and stirs, final adjustment pH is to about 9.2, freeze drying 48h, obtains the gluey self assembly hydroxyapatite/oxidized starch/gelatin gel bundle of milky, for Physickemical Properties.
Further, its analysis hydroxyapatite/oxidized starch/gelatin structural approach is:
A), infrared spectrum (FT-IR) is analyzed: by obtained hydroxyapatite/oxidized starch/gelatin hydridization xerogel freeze drying, pulverize, get appropriate amount of sample and a certain amount of KBr is ground into salt sheet, at 100 DEG C, dry 4h, then tests;
B), X-ray diffraction spectroscopic assay: the powder getting appropriate hydroxyapatite/oxidized starch/gelatin hydridization xerogel bundle carries out thing phase and the degree of crystallinity of testing this hydridization xerogel bundle on XRD-2000PS type X diffractometer;
C), the microstructure of scanning electron microscope analysis hydroxyapatite/oxidized starch/gelatin hydridization xerogel and crystallite dimension;
D), specific surface and the aperture of hydroxyapatite/oxidized starch/gelatin hydridization xerogel analyzed by full-automatic specific area fast and mesopore/micropore analyzer.
Beneficial effect
Rear for cornstarch oxidation and gelatin are cross-linked by the present invention, then prepare hydroxyapatite/oxidized starch/gelatin hydridization xerogel bundle with hydroxyapatite self assembly prepared by agglutinating nature yeast.With FT-IR, XRD, BET and SEM, the crystalline structure, chemical composition, microscopic appearance, aperture size etc. of this hydridization xerogel bundle are characterized.Result shows, hydroxyapatite/oxidized starch/gelatin hydridization xerogel bundle has even structure amorphism structure, loose porous, has certain specific area and aperture, can adsorb the metal ion in waste water and reactive dye, is a kind of multi-functional hydridization sorbing material.
Accompanying drawing explanation
Fig. 1 is Making programme schematic diagram of the present invention.
Fig. 2 is the FTIR atlas analysis figure of inventive samples.
Fig. 3 is the XRD analysis curve synoptic diagram of inventive samples.
Fig. 4-(a) is the oxidised maize starch/gelatin SEM schematic diagram of inventive samples.
Fig. 4-(b) is the hydroxyapatite/oxidised maize starch/gelatin SEM schematic diagram of inventive samples.
Fig. 5 a is the N of inventive samples
2adsorption and desorption isotherms schematic diagram.
Fig. 5 b is the sample BET equation diagram of inventive samples.
Fig. 5 c is the aperture differential distribution map of inventive samples.
Detailed description of the invention
A kind of two gel adsorber and preparation method thereof, the material required for it has: gelatin (analyzing pure), hydrogen peroxide (analyzing pure), hydrochloric acid (analyzing pure), NaOH (analyzing pure), calcium hydroxide (analyzing pure), phosphoric acid (analyzing pure), cornstarch (analyzing pure); Instrument required for it has: 98HW-1 type thermostatic mixer, JSM26460 SEM, JM-1200GX type transmission electron microscope, X/max2000PC type X-ray diffractometer, ASAP2020 series full-automatic specific area and mesopore/micropore analyzer fast; Its making step: (1) prepares oxidized starch, (2) are prepared oxidized starch/gelatin (3) and prepared hydroxyapatite/oxidized starch/gelatin, (4) analysis hydroxyapatite/oxidized starch/gelatin structure.
Wherein, it is prepared oxidized starch method and is: in three-necked bottle, add the corn starch milk that mass fraction is 30%, with 1% NaOH and hydrochloric acid, its pH value is adjusted to 4.0; Then warming while stirring is incubated 1h to 80 DEG C, and the temperature of reactant liquor remains on 50 DEG C and continues to stir the hydrogen peroxide slowly dripping cornstarch mass fractions 30%, dropwises rear reaction 6h, by mixed liquor high speed centrifugation separation immediately; The oxidised maize starch obtained is at vacuum drying chamber, and drying box temperature is 45 DEG C, dry 24h; Survey final oxidized starch containing carboxyl amount by conductometry, hydroxylamine hydrochloride potentiometric titration records aldehyde radical amount.
Wherein, it is prepared oxidized starch/gelatin method and is: at 50 DEG C, compound concentration is the gelatin solution of 3%, adds appropriate oxidised maize starch, and gelatin and oxidised maize starch mass ratio are 6: 4, regulates pH to be 5.5; Reactant liquor is warming up to 80 DEG C, front 30min rotating speed is 100rpm, and rear 30min rotating speed is 500rpm, obtained oxidized starch/gelatin solution.
Wherein, it is prepared hydroxyapatite/oxidized starch/gelatin method and is: adopt sol-gel process to prepare containing Na
2+ion hydroxyapatite is configured to solution, joins in the solution of oxidized starch/gelatine system, is incubated 60 DEG C and stirs, final adjustment pH is to about 9.2, freeze drying 48h, obtains the gluey self assembly hydroxyapatite/oxidized starch/gelatin gel bundle of milky, for Physickemical Properties.
Wherein, its analysis hydroxyapatite/oxidized starch/gelatin structural approach is:
A), infrared spectrum (FT-IR) is analyzed: by obtained hydroxyapatite/oxidized starch/gelatin hydridization xerogel freeze drying, pulverize, get appropriate amount of sample and a certain amount of KBr is ground into salt sheet, at 100 DEG C, dry 4h, then tests;
Fig. 2 illustrates the FTIR collection of illustrative plates change before and after hydroxyapatite/oxidized starch/gelatin preparation.Curve b (gelatin) is infrared is presented at 1625 and 1540cm
-1occur that typical amino I band and amino II are with.2625 and 2250cm
-1belong to the stretching vibration of C-H.At 3400-3100,3000-2700cm
-1it is 0-H and the C-H stretching vibration of alcoholic extract hydroxyl group.Curve c (oxidised maize starch) compares, at 1750cm with curve a (cornstarch)
-1there is new peak, this is because create the vibration of C=0 key after oxidation, demonstrate the existence of the rear aldehyde radical of oxidation.In the infared spectrum of curve d (oxidised maize starch/gelatin) and e (hydroxyapatite/oxidised maize starch/gelatin), 800,1750cm
-1peak intensity corresponding to C-H and C=0 vibration strengthens all to some extent, and at 1550cm
-1, 1530cm
-1the absworption peak of left and right is caused by the coupling of N-H flexural vibrations and C-N stretching vibration, to show in amino group in gelatin and oxidized starch that aldehyde groups there occurs acid amides reaction and generate schiff bases.From curve e, also 1350cm can be found out simultaneously
-1also there is the wave number of red shift in left and right, this red shift is by the Ca in hydroxyapatite
2+form with the carboxylic group of gelatin that covalent bond causes, as compared to curve b with d, at 1030cm by curve e simultaneously
-1there is P0 in left and right
4 3-characteristic absorption peak, can show to there is hydroxyapatite in composite.
B), X-ray diffraction spectroscopic assay: the powder getting appropriate hydroxyapatite/oxidized starch/gelatin hydridization xerogel bundle carries out thing phase and the degree of crystallinity of testing this hydridization xerogel bundle on XRD-2000PS type X diffractometer;
XRD can the crystalline structure of expression product well, indirectly can reflect pore size and duct order degree.As Fig. 3 XRD result shows that 20 of ative starch curve a is 15 °, 17 °, 22 °, 23 ° and 24 °, show that starch has crystal structure.After oxidation, 20 of curve obtained b is 15 °, 17 ° and 22 °, lower than ative starch peak value, illustrates that the crystal formation of oxidized starch will reduce greatly, and 24 ° of disappearances of 20, prove the existence in armorphous region simultaneously.In curve c (oxidised maize starch/gelatin), 23 ° of 20 also disappear, prove have new chemical substance to generate between gelatin and oxidised maize starch, cause the destruction in crystal formation region, such amorphous structure is conducive to this gel strands for sorbing material.Known from curve d, along with the increase of hydroxyapatite in solution and oxidized starch/gelatin degree of cross linking, in hydroxyapatite (201) and the increase of (211) crystal face characteristic diffraction peak halfwidth of 25.9 ° and 31.8 ° place's appearance, peak height reduces, according to Xie Er formula, the crystallite dimension of the hydroxyapatite formed diminishes, and degree of crystallinity reduces.The reason of this phenomenon is caused to be along with hydroxyapatite and oxidized starch/gelatin are cross-linked, the Ca more in polyhydroxy apatite
2+and there is chemical bond between free C00-out in collagen, form the ionic bond that stable height combines energy, consume more Ca
2+, and Ca
2+that the growth of hydroxyapatite forming core is necessary, Ca
2+minimizing, reduce the degree of crystallinity of material, hinder growing up of hydroxyapatite crystal.And the size in its aperture tentatively can be judged by XRD, and although absolute peak intensity is not high, peak shape rule, illustrative material possesses ordered mesoporous pore canals, but actual conditions must consider the wall thickness of these porous materials, the distance between adjacent aperture centers, deduction wall thickness just can obtain effective aperture.Thus the true aperture of mesoporous material must be measured by the means such as isothermal nitrogen adsorption desorption and lens.
C), the microstructure of scanning electron microscope analysis hydroxyapatite/oxidized starch/gelatin hydridization xerogel and crystallite dimension.
As Fig. 4 shows the SEM photo of 350 times of lower oxidised maize starch/gelatin Fig. 4-(a) and hydroxyapatite/oxidized starch/gelatin gel bundle Fig. 4-(b).Characterized known when not adding hydroxyapatite by SEM, the pore structure of oxidised maize starch/gelatin gel bundle is not obvious, and after adding hydroxyapatite, clearly find out that this xerogel bundle has obvious loose structure, material surface is dispersed with the hole much run through mutually, and such hole result is beneficial to this gel strands for waste water adsorbs, there is coagulation function etc.From Fig. 4-(b), also can find out hydroxyapatite crystal and the abundant compound of oxidized starch/gelatin of biological hybridized hydrogel simultaneously, inorganic phase and organic phase distribution comparatively evenly, further demonstrate that this gel strands that XRD spectra judges is the hole dielectric material with certain pore size simultaneously.
D), specific surface and the aperture of hydroxyapatite/oxidized starch/gelatin hydridization xerogel analyzed by full-automatic specific area fast and mesopore/micropore analyzer.
Specific area and the pore-size distribution situation of material can be obtained more exactly, from Fig. 5 a: sample Adsorption and desorption isotherms belongs to the 4th class multilayer absorption, and illustrative material is a kind of mesoporous material by isothermal nitrogen adsorption desorption curve.Due to during sample adsorption and desorption time thermoisopleth do not overlap, there is corresponding hysteresis loop in dividing potential drop section respectively, and hysteresis loop be by with N
2in sample, produce the result of capillary condensation, ring larger expression aperture is larger; From Fig. 5 b: sample is to N
2be adsorbed on low-pressure area and obey BET bis-constant equation, according to this equation calculate to specific area be 30.4783m
2/ g.The specific area of the hydroxyapatite of actual measurement is 28.75m
2/ g, known hydroxyapatite and oxidized starch/gelatin there occurs effect, and synthesized material specific surface increases, and more can keep order and the integrality of pore passage structure, can be used as the absorption of metal ion and dye ions.Known by Fig. 5 c, according to the sorting technique of IUPAC, this sample between the hole of (2-50nm) be mesopore, and pore size distribution is even, the SEM spectrogram of composition graphs 4-(a) and Fig. 4-(b), hole surface and hole count situation, known synthesized self assembly hydroxyapatite/oxidized starch/gelatin gel bundle has certain specific area, and aperture is more and even, this material has certain adsorption capacity.
Embodiment recited above is only be described the preferred embodiment of the present invention, not limits the spirit and scope of the present invention.Under the prerequisite not departing from design concept of the present invention; the various modification that this area ordinary person makes technical scheme of the present invention and improvement; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (5)
1. two gel adsorber and preparation method thereof, the material required for it has: gelatin (analyzing pure), hydrogen peroxide (analyzing pure), hydrochloric acid (analyzing pure), NaOH (analyzing pure), calcium hydroxide (analyzing pure), phosphoric acid (analyzing pure), cornstarch (analyzing pure); Instrument required for it has: 98HW-1 type thermostatic mixer, JSM26460 SEM, JM-1200GX type transmission electron microscope, X/max2000PC type X-ray diffractometer, ASAP2020 series full-automatic specific area and mesopore/micropore analyzer fast; Its making step: (1) prepares oxidized starch, (2) prepare oxidized starch/gelatin, (3) prepare hydroxyapatite/oxidized starch/gelatin, (4) analyze hydroxyapatite/oxidized starch/gelatin structure.
2. two gel adsorber of one according to claim 1 and preparation method thereof, it is characterized in that: it is prepared oxidized starch method and is: in three-necked bottle, add the corn starch milk that mass fraction is 30%, with 1% NaOH and hydrochloric acid, its pH value is adjusted to 4.0; Then warming while stirring is incubated 1h to 80 DEG C, and the temperature of reactant liquor remains on 50 DEG C and continues slowly to stir the hydrogen peroxide slowly dripping cornstarch mass fractions 30%, dropwises rear reaction 6h, by mixed liquor high speed centrifugation separation immediately; The oxidised maize starch obtained is dry at vacuum drying chamber, and drying box temperature is 45 DEG C, dry 24h; Survey final oxidized starch containing carboxyl amount by conductometry, hydroxylamine hydrochloride potentiometric titration records aldehyde radical amount.
3. two gel adsorber of one according to claim 1 and preparation method thereof, it is characterized in that: it is prepared oxidized starch/gelatin method and is: at 50 DEG C, compound concentration is the gelatin solution of 3%, add appropriate oxidised maize starch, gelatin and oxidised maize starch mass ratio are 6: 4, regulate pH to be 5.5; Reactant liquor is warming up to 80 DEG C, front 30min rotating speed is 100rpm, and rear 30min rotating speed is 500rpm, obtained oxidized starch/gelatin solution.
4. two gel adsorber of one according to claim 1 and preparation method thereof, is characterized in that: it is prepared hydroxyapatite/oxidized starch/gelatin method and is: adopt sol-gel process to prepare containing Na
2+it is 30% solution that ion hydroxyapatite is configured to mass fraction, joins in the solution of oxidized starch/gelatine system, and hydroxyapatite accounts for 30% of oxidized starch/gelatin solid masses; Be incubated 60 DEG C to stir, the final pH that regulates is to about 9.2, and freeze drying 48h, obtains the gluey self assembly hydroxyapatite/oxidized starch/gelatin gel bundle of milky, for Physickemical Properties.
5. two gel adsorber of one according to claim 1 and preparation method thereof, is characterized in that: its analysis hydroxyapatite/oxidized starch/gelatin structural approach is:
A), infrared spectrum (FT-IR) is analyzed: by obtained hydroxyapatite/oxidized starch/gelatin hydridization xerogel freeze drying, pulverize, get appropriate amount of sample and a certain amount of KBr is ground into salt sheet, at 100 DEG C, dry 4h, then tests;
B), X-ray diffraction spectroscopic assay: the powder getting appropriate hydroxyapatite/oxidized starch/gelatin hydridization xerogel bundle carries out thing phase and the degree of crystallinity of testing this hydridization xerogel bundle on XRD-2000PS type X diffractometer;
C), the microstructure of scanning electron microscope analysis hydroxyapatite/oxidized starch/gelatin hydridization xerogel and crystallite dimension;
D), specific surface and the aperture of hydroxyapatite/oxidized starch/gelatin hydridization xerogel analyzed by full-automatic specific area fast and mesopore/micropore analyzer.
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| CN111439768A (en) * | 2020-04-28 | 2020-07-24 | 广西夏阳环保科技有限公司 | Preparation method of high-activity nano calcium hydroxide |
| CN114797789A (en) * | 2022-04-28 | 2022-07-29 | 陕西科技大学 | Carboxymethyl starch/collagen polypeptide/attapulgite composite material adsorbent |
| CN114870810A (en) * | 2022-05-31 | 2022-08-09 | 西南科技大学 | Preparation and application of hydroxyapatite/collagen composite aerogel material for efficiently capturing iodine vapor |
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